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Lp = 1332 cm
l = 12
t = 15
maka :
Lp = 2 x (pxl + lxt + pxt)
1332 = 2 x (px12 + 12x15 + px15)
1332 = 2 x (12p + 180 + 15p)
1332 = 2 x (27p + 180)
1332 = 54p + 360
54p = 1332 - 360
p = 972/54
p = 18 cm (B)